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Axial Piston Pump OEM A4VG
Axial Piston Pump OEM A4VG
Axial Piston Pump OEM A4VG
Axial Piston Pump OEM A4VG
Axial Piston Pump OEM A4VG
Axial Piston Pump OEM A4VG
  1. Axial Piston Pump OEM A4VG
  2. Axial Piston Pump OEM A4VG
  3. Axial Piston Pump OEM A4VG
  4. Axial Piston Pump OEM A4VG
  5. Axial Piston Pump OEM A4VG
  6. Axial Piston Pump OEM A4VG

Axial Piston Pump OEM A4VG

1).Integrated auxliay pump for boost and piot oilsupply.

2).Flow direcion changes smoothy when the swashplate is moved through the neutral postion

3).High-pressure relief valves with integated boost function.

4).With adjustable pressure cut-off as standard

5).Boost-pressure relief valve

Detailed description

This is a variable pump equipped with an axial piston rotary group of swashplate design, specifically tailored for hydrostatic drive systems in open circuits, suitable for a variety of industrial and mobile hydraulic application scenarios. It is equipped with an integrated auxiliary pump that provides stable boost and pilot oil supply, ensuring reliable operation of the system’s control components and preventing cavitation. The output flow of the pump is strictly proportional to its drive speed and displacement; by precisely adjusting the swashplate angle, the flow can be infinitely and steplessly varied, and when the swashplate moves through the neutral position, the flow direction changes smoothly without pressure fluctuations. It is configured with high-pressure relief valves with integrated boost function and a dedicated boost-pressure relief valve to protect the system from overpressure and maintain stable boost pressure. With adjustable pressure cut-off as standard, it allows flexible pressure setting, and it also boasts excellent suction performance, adapts to variable-speed drives, supports HF mode for reduced data in HFC mode, with a special version available for specific needs.

Type code

01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22
A4V G D / 32 - N

Axial pistion unit

01 Swashplate design, variable, nominal pressure 400 bar, maximum pressure 450 bar A4V

Operating mode

02 Pump, closed circuit G

Size (NG)

03 Geometric displacement, see "Technical data" on page 8 28 40 56 71 90 125 180

Control device

28 40 56 71 90 125 180
04 Without control module ● ● ● ● ● ● ● NV
Proportional control, hydraulic Pilot-pressure related p = 6 to 18 bar ● ● ● ● ● ● ● HD3
Mechanical servo ● ● ● ● ● ● ● HW
Proportional control, electric U=12V ● ● ● ● ● ● ● EP3
U=24V ● ● ● ● ● ● ● EP4
Two-point control, electric U=12V ● ● ● ● ● ● ● EZ1
U=24V ● ● ● ● ● ● ● EZ2
Automatic control, speed related U=12V ● ● ● ● ● ● ● DA1
U=24V ● ● ● ● ● ● ● DA2
tydraulic control, direct operated ● ● ● ● ● ● ● DG
Electric control, direct operated,

two pressure reducing valves

 U=12V ● ● ● ● - - - ET5
U=24V ● ● ● ● - - - ET6

Pressure cut-off

05 Pressure cut-off(standard) D

Neutral position switch

06 Without neutral position switch (without code) ●
Neutral position switch (for HW control only) ● L

Mechanical stroke limiter

07 Without mechanical stroke limiter (without code) ●
Mechanical stroke limiter, externally adjustable ● M

Stroking chamber pressure port

06 Without stroking chamber pressure port X3, X4 without code ●
Stroking chamber pressure port X3, X4 ● T

DA control valve

NV HD HW DG DA EP EZ
09 Without DA control valve ● ● ● ● - ● ● 1
DA control valve, fixed setting - ● ● ● ● ● - 2
DA control valve, mechanically adjustable with position lever direction of actuation, clockwise - ● ● ● ● ● - 3R
direction of actuation,

counter-clockwise

 - ● ● ● ● ● - 3L
DA control valve, fixed setting, ports for pilot control device - ● ● - ● ● - 7
DA control valve, fixed setting and brake inch valve mounted, control with brake fluid based on mineral oil - - - - ● - - 8

•= available   ○= on request   -= not available     = preferred program

Series

10 Series 3, index 2 32

Direction of rotation

11 Viewed from shaft end clockwise R
counter-clockwise L

Sealing material

12 NBR(nitrile rubber),shaft seal in FKM (fluoroelastomer) N

Drive shaft

28 40 56 71 90 125 180
13 Splined shaft

DIN 5480

 for single pump ● ● ● ● ● ● ● Z
for combination pump-1st pump _1) ● ● ● ● ● _2) A
Splined shaft

ANSI B92. 1a

 for single pump ● ● ● ● ● ● ● S
for combination pump-1st pump _2) _2) ● ● _2) ● ● T
for combination pump-2nd pump - ● - - ● - - U

Mounting flange

28 40 56 71 90 125 180
14 SAE J744 2-hole ● ● ● - - - - C
4-hole - - - - - - ● D
2+4-hole - - - ● ● ● - F

Working port

28 40 56 71 90 125 180
15 SAE Working port A and B, top and bottom Suction port S bottom - ● ● ● ● ● ● 02
SAE Working port A and B, top and bottom Suction port S top - ● ● ○ ○ ○ ○ 03
SAE Working port A and B, same side right3) Suction port S bottom ● - - - - - - 10
SAE Working port A and B, same side left3) Suction port S bottom - - - ● ○ ● -
SAE Working port A and B, same side right3) Suction port S top - - - ○ ○ ○ - 13
SAE Working port A and B, same side left3) Suction port S top ● - ● - - - -

Boost pump

16 Without integrated boost pump without through drive N
with through drive K
Integrated boost pump with and without through drive F

Through drive

28 40 56 71 90 125 180
17 Without through drive, versions N and F(no. 16) only ● ● ● ● ● ● ● 00
Flange SAE J7444) Hub for splined shaft
82-2(A) 5/8 in 9T 16/32DP5) ● ● ● ● ● ● ● 01
101-2(B) 7/8 in 13T 16/32DP5) ● ● ● ● ● ● ● 02
1 in 15T 16/32DP5) ● ● ● ● ● ● ● 04
127-2(C) 1 in 15T 16/32DP5) - ● - - - - - 09
1 1/4 in 14T 12/24DP5) - - ● ● ● ● ● 07
52-2/4(D) W35 2X16X9g7) - - - - ● - - 73
1 3/4 in 13T 8/16DP5) - - - - - ● ● 69
165-4(E) 1 3/4 in 13T 8/16DP5) - - - - - - ● 72

•= available   ○= on request   -= not available

1)Standard for combination pump-1st pump:Shaft Z

2) Standard for combination pump -1st pump:Shaft S

3) Only possible without attachment filter

4)2=2-hole;4=4-hole

5) Hub for splined shaft to ANSI B92.1a

6) NG90 to 180 with additional 4-hole-flange (127-4)

7) Hub for splined shaft according to DIN 5480.

High-pressure relief valve

Setting rabe Δp 28 40 56 71 90 125 180
18 High-pressure relief valve,pilot operated 100 to 420 bar with bypass - - - ● ● ● ● 1
High-pressure relief valve,direch operated, fixed setting 250 to 420 bar without bypass ● ● ● - - - - 3
with bypass ● ● ● - - - - 5
100 to 250 bar without bypass ● ● ● - - - - 4
with bypass ● ● ● - - - - 6

Filtration boost circuit/external boost pressure supply

28 40 56 71 90 125 180
19 Filtration in the boost pump suction line ● ● ● ● ● ● ● S
Filtration in the boost pump pressure line

Porst for external boost circuit filtration (Fe and Fa)

 ● ● ● ● ● ● ● D
Attachment filter with cold start valve - ● ● ● ● ● ● F
Attachment filter with cold start valve and visual contamation indicator - ● ● ● ● ● ● P
Attachment filter with cold start valve and electric contamation indicator - ● ● ● ● ● ● B
External boost pressure supply (version without integrated boost pump-N00, K...) ● ● ● ● ● ● ● E

Swivel angle sensor

28 to 180
20 Without swivel angle sensor (without code) ●
Electric swivel angle sensor8) ● R

Connector for solenoids9)

28 to 180
21 Without connector (without code),only for purely hydraulic control ●
DEUTSCH molded connector,2-pin without suppressor diode ● P
with suppressor diode(only for EZ and DA) ● Q

Standard/special version

22 Standard version without code
combined with attachment part or attachment pump -K
Special version -S
combined with attachment part or attachment pump -SK

•= available    ○= on request    -= not available     = preferred program

Notice

▶In addition to the type code,please specify the

relevant technical data when placing your order.

8)Please contact us if the swivel angle sensor is used for control

9) Connectors for other electric components may deviate

Technical data

Size

Displacement.geometric.per revolution

 NG 28 40 56 71 90 125 180
variable pump Vg max cm3 28 40 56 71 90 125 180
boost pump (at p=20bar) VgSp cm3 6.1 8.6 11.6 19.6 19.6 28.3 39.8
Rotational speed1) maximum at Vg max nnom rpm 4250 4000 3600 3300 3050 2850 2500
limted,maximum2) nmax1 rpm 4500 4200 3900 3600 3300 3250 2900
intermittent,maximum3) nmax2 rpm 5000 5000 4500 4100 3800 3450 3000
minimum nmin rpm 500 500 500 500 500 500 500
Flow at nnom and Vg max qv I/min 119 160 202 234 275 356 450
Power4) at nnom，Vg max and Δp = 400 bar P kW 79 107 134 156 183 238 300
Torque4) at Vg max and Δp = 440 bar T Nm 178 255 357 452 573 796 1146
Δp = 100 bar T Nm 45 64 89 113 143 199 286
Rotary stiffness of drive shaft S c kNm/rad 31.4 69 80.8 98.8 158.1 218.3 244.5
T c kNm/rad - - 95 120.9 - 252.1 318.4
A c kNm/rad - 79.6 95.8 142.4 176.8 256.5 -
Z c kNm/rad 32.8 67.5 78.8 122.8 137 223.7 319.6
U c kNm/rad - 50.8 - - 107.6 - -
Moment of inertia for rotary group JTW Kgm2 0.0022 0.0038 0.0066 0.0097 0.0149 0.0232 0.0444
Maximum angular acceleration5) α rad/s2 38000 30000 24000 21000 18000 14000 11000
Case volume V L 0.9 1.1 1.5 1.3 1.5 2.1 3.1
Weight (without through drive) approx. m kg 29 31 38 50 60 80 101

Notice

▶Theoretical values, without efficiency and tolerances;values rounded

▶Operation above the maximum values or below the minimum values may result in a loss of function, a reduced service life or in the destruction of the axial piston unit.

Determining the operation characteristics

Flow qv=(Vg ∙ n ∙ ηv) / 1000 I/min
Torque T=(Vg ∙ Δp) / 20 ∙ π ∙ ηhm Nm
Power P=(2π ∙ T ∙ n)/60000=(qv ∙ Δp)/600 ∙ ηt kW

Key

Vg  Displacement per revolution in [cm3]

Δp  Differential pressure [bar]

n  Rotational speed [rpm]

ηv  Volumetric efficiency

ηhm  Hydraulic-mechanical efficiency

ηt  Total efficiency (ηt= ηv*ηhm)

1) The values are applicable:

- for the optimum viscosity range from n =36 to 16mm2/s

- for hydraulic fluid based on mineral oils (for HF hydraulic fluids,observe the technical data in 90225)

2)Valid at half corner power (e.g.at Vg max and p,/2)

3) Valid at Δp=70 to 150 bar or Δp < 300 bar and t<0.1s

4) Without boost pump

5) The data are valid for values between the minimum required and maximum permissible rotational speed.Valid for external excitation (e.g.diesel engine 2 to 8 times rotary frequency,cardan shaft twice the rotar frequency).

The limit value is only valid for a single pump.

The load capacity of the connection parts must be considered.

Variable Displacement Piston pump A4VG

A4VG